CN115870365B - Processing method of medical nickel-titanium pipe - Google Patents
Processing method of medical nickel-titanium pipe Download PDFInfo
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- CN115870365B CN115870365B CN202310055193.XA CN202310055193A CN115870365B CN 115870365 B CN115870365 B CN 115870365B CN 202310055193 A CN202310055193 A CN 202310055193A CN 115870365 B CN115870365 B CN 115870365B
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Abstract
The application discloses a processing method of a medical nickel-titanium pipe, which comprises the following steps: s1, preparing a nickel-titanium rod blank; s2, perforating and cutting the nickel-titanium rod blank prepared in the step S1 to prepare a nickel-titanium tube blank; s3, carrying out one or more cold deformation drawing treatments after penetrating the nickel-titanium tube blank prepared in the step S2 through the hard core rod; s4, the nickel-titanium tube blank subjected to cold deformation drawing treatment in the step S3 is communicated with a hard core rod to be annealed together; s5, circulating the step S3 and the step S4 until the nickel-titanium tube blank reaches the size of the medical nickel-titanium tube required to be prepared; and finally, carrying out straightening heat treatment and hard core rod removal operation on the nickel-titanium tube blank, and carrying out subsequent surface treatment to obtain a medical nickel-titanium tube product. The processing method is simple and feasible, the cost is low, and the prepared nickel-titanium pipe is high in dimensional accuracy, good in surface quality and excellent in fatigue performance, and meets the use requirements of medical implantation grade.
Description
Technical Field
The application relates to the technical field of medical instruments, in particular to a processing method of a medical nickel-titanium tube.
Background
Nickel-titanium shape memory alloy, which is a typical functional material, has excellent biocompatibility, corrosion resistance and wear resistance in addition to unique shape memory effect and superelasticity, and has been widely used in biomedical fields and the like. Such as nickel-titanium alloy tubing for minimally invasive implantation of interventional heart valves, peripheral vascular stents, aortic vascular stents, left atrial appendage occluders, and the like.
However, since the minimally invasive implantation of nickel-titanium alloy tubing is required to have higher dimensional accuracy, good surface quality and excellent fatigue performance, the above technical requirements are temporarily difficult to achieve by the current domestic processing technology. Therefore, nickel-titanium alloy tubing used by cardiovascular and cerebrovascular medical instrument manufacturers in China mainly depends on import and is monopolized by a few enterprises such as US Fort Wayne Metals, US Memry, germany Euroflex and the like for a long time, belongs to a neck-clamping material, and severely restricts the development of domestic high-end medical instruments.
The existing nickel-titanium pipe has the main processing methods of hot extrusion, hot rolling, cold drawing and the like. Although the hot extrusion and the hot rolling have advantages in preparing large-size nickel-titanium pipes, the hot extrusion and the hot rolling have obvious disadvantages in terms of dimensional accuracy and surface quality compared with cold working (cold rolling and cold drawing), cannot be applied to the preparation of medical nickel-titanium pipe finished products at present, and only have application in the preparation of medical nickel-titanium pipe blanks.
The nickel-titanium pipe is prepared by cold rolling, although the production efficiency is high, the metal loss is less, the yield is high, and the production process can be automated; however, nickel-titanium alloy is easy to produce work hardening, and has large deformation rebound, which belongs to a very difficult-to-process material, so that the deformation degree and deformation speed must be strictly controlled in the cold rolling process, otherwise, cracks are very easy to occur. In addition, when a medical nickel-titanium tube with a relatively large diameter and thickness is produced, deformation and rebound are caused by processing stress, so that the roundness often cannot meet the requirement.
Cold drawing is the most common forming mode for producing thin-diameter thin-wall pipes at present. Because of the difficult processing characteristics of nickel-titanium alloys, cold drawing lubrication is a difficult problem, especially good lubrication of the inner surface is difficult to achieve, so that high quality inner surface quality is difficult to achieve by both the floating mandrel drawing method and the fixed short-core drawing method. In order to improve the quality of the inner surface of the pipe and the dimensional accuracy, a hard mandrel drawing method may be used. However, due to the high hardening strength and high deformation resilience of the nickel-titanium alloy, the extrusion force of the tube blank to the core rod in the drawing process is large, and a large holding force exists between the tube blank and the core rod after drawing, so that great difficulty is caused in removing the core rod.
Disclosure of Invention
In order to solve at least one technical problem, a process method which is low in process difficulty and low in cost and can greatly ensure the quality of the processed nickel-titanium pipe is developed.
The processing method of the medical nickel-titanium pipe provided by the application comprises the following steps:
s1, preparing a nickel-titanium rod blank, and then carrying out annealing treatment and surface machining treatment on the nickel-titanium rod blank;
s2, perforating and cutting the nickel-titanium rod blank prepared in the step S1 to prepare a nickel-titanium tube blank, and then cleaning and annealing the nickel-titanium tube blank;
s3, carrying out one or more cold deformation drawing treatments after penetrating the nickel-titanium tube blank prepared in the step S2 through the hard core rod;
s4, the nickel-titanium tube blank subjected to cold deformation drawing treatment in the step S3 is communicated with a hard core rod to be annealed together;
s5, circulating the step S3 and the step S4 until the nickel-titanium tube blank reaches the size of the medical nickel-titanium tube required to be prepared;
s6, straightening and heat-treating the nickel-titanium tube blank and the hard core rod obtained in the step S5, and then carrying out hard core rod removal operation to obtain a medical nickel-titanium tube semi-finished product;
s7, carrying out subsequent surface treatment on the medical nickel-titanium tube semi-finished product obtained in the step S6 to obtain a medical nickel-titanium tube finished product.
By adopting the technical scheme, the nickel-titanium alloy pipe is prepared through the process route of wire cutting blank making and pipe cold deformation drawing, all the used equipment is common equipment in the field, and the overall equipment cost is low; the cold deformation drawing forming process of the hard core rod is adopted, so that the core rod and the pipe can synchronously move in the drawing process, almost no friction exists between the core rod and the inner wall of the pipe blank, the drawing stress can be greatly reduced, the dimensional accuracy of the pipe blank is further improved, and the pipe has good coaxiality and uniform wall thickness; the wire cutting process and the cold deformation drawing process are combined, so that the small-diameter thin-wall nickel-titanium alloy pipe can be prepared, and the prepared pipe is high in size precision, good in surface quality and excellent in fatigue performance; in addition, the process has high utilization rate of materials, and can greatly reduce the material cost; according to the method, the nickel-titanium alloy tube blank and the hard core rod are annealed together, so that the problem that the core rod is difficult to remove after cold drawing is finished is avoided, the same hard core rod can be used for multiple times, and the effect of further saving cost is achieved; in addition, the inner surface quality of the nickel-titanium alloy tube blank can be greatly ensured, so that the dimensional accuracy and the surface quality of the tube are improved; according to the method, the mandrel withdrawing operation is performed after the straightening heat treatment, so that the difference of the thermal expansion coefficients of the hard mandrel and the nickel-titanium alloy material is utilized, the mandrel withdrawing treatment of the nickel-titanium alloy tube blank is facilitated, the high hardness of the hard mandrel is utilized, the high mechanical property can be maintained after long-time high temperature, the requirement of the high hardness in the cold deformation drawing process of the nickel-titanium alloy tube can be completely met, and further the processed tube is ensured to have high dimensional accuracy and surface quality.
Optionally, in the step S1, the annealing temperature is controlled to be 700-850 ℃ and the time is controlled to be 20-60 minutes.
Optionally, in the step S1, the size of the rod blank is phi 10.00-35.00 mm.
Optionally, in the step S2, the perforation and cutting are spark perforation and wire cutting.
Optionally, the wire cutting adopts medium-speed wire cutting or slow-speed wire cutting.
Through adopting above-mentioned technical scheme, this application adopts well wire-feed or slow wire-feed cutting mode preparation tube blank, and tube blank internal surface dimensional accuracy is high, surface quality is good, can direct processing minor diameter tube blank, under the prerequisite of guaranteeing total deflection, has reduced the drawing process from thick pipe to tubule in the conventional technology, greatly reduced the cost.
Optionally, in the step S2, the annealing temperature is controlled to 650-750 ℃, atmosphere protection annealing is adopted, the time is controlled to 10-60 minutes, and the protection atmosphere adopts argon or nitrogen.
Further optionally, in the step S2, the size of the nickel-titanium tube blank is 5.00-15.00 mm, and the wall thickness is 0.20-3.00 mm.
Optionally, in step S3, the hard core rod is made of high-speed steel.
Optionally, in the step S3, the drawing deformation amount of the cold deformation drawing process is controlled to be 8-25%.
Optionally, in the step S3, the cold deformation drawing process uses a water-based lubricating liquid, and after the cold deformation drawing process, the lubricating liquid and the scraps on the nickel-titanium tube blank and the hard core rod need to be cleaned.
Optionally, in the step S4, the annealing treatment is performed when the cumulative deformation amount of the cold deformation drawing treatment in the step S3 reaches 20% -45%.
Optionally, in the step S4, the annealing temperature is controlled to be 450-600 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-60 minutes, and the protection atmosphere adopts argon or nitrogen.
Further optionally, in the step S5, the size of the medical nickel-titanium tube to be prepared is 2-15 mm in inner diameter phi and 0.05-1.00 mm in wall thickness.
Optionally, in the step S6, the straightening heat treatment heats the nickel-titanium tube blank and the hard core rod in an external heating or internal heating mode, then applies tension to two ends of the nickel-titanium tube blank and the hard core rod for straightening, and finally cools the nickel-titanium tube blank and the hard core rod.
Through adopting above-mentioned technical scheme, in this application straightening process, through exerting tension between nickel titanium alloy tubular product and the stereoplasm plug, can guarantee the phenomenon that the tube is out of shape in the straightening process to be favorable to preparing the nickel titanium alloy tubular product that the straightness accuracy is higher.
Further optionally, the heating temperature is controlled to be 400-600 ℃, the time is controlled to be 1-20 min, and the tension is controlled to be 20-100 MPa.
Optionally, in the step S6, the core rod withdrawing operation is performed below the martensitic transformation temperature Mf of the nickel-titanium alloy, and the temperature is controlled to be between-40 ℃ and-196 ℃.
By adopting the technical scheme, the mandrel stripping operation is carried out in the low-temperature environment lower than the martensitic transformation temperature Mf of the nickel-titanium alloy, so that a semi-finished product tube is obtained, the characteristics of being very soft and easy to deform of the nickel-titanium alloy in a martensitic state can be effectively utilized, and the mandrel can be easily stripped by using the conventional mandrel stripping operation; and after the nickel-titanium pipe with the core rod removed is restored to room temperature, the original shape can be restored, and the size precision and the surface quality of the nickel-titanium pipe can be ensured.
Optionally, in the step S7, the subsequent surface treatment includes an inner surface pickling and an outer surface polishing treatment.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. according to the nickel-titanium alloy pipe prepared by the process route of wire cutting blank making and pipe cold deformation drawing, the used equipment is common equipment in the field, the cost of the whole equipment is low, and the thin-wall pipe with the inner diameter phi of 2.00-15.00 mm and the wall thickness of 0.05-1.00 mm can be prepared.
2. The cold deformation drawing forming process of the hard core rod is adopted, so that the core rod and the pipe synchronously move in the drawing process, friction is hardly generated between the core rod and the inner wall of the pipe blank, drawing stress can be greatly reduced, the dimensional accuracy of the pipe blank is further improved, and the pipe has good coaxiality and uniform wall thickness.
3. The wire cutting process and the cold deformation drawing process are combined, so that the small-diameter thin-wall nickel-titanium alloy pipe can be prepared, and the prepared pipe is high in size precision, good in surface quality and excellent in fatigue performance; in addition, the process has high utilization rate of materials, and can greatly reduce the material cost.
4. According to the method, the nickel-titanium alloy tube blank and the hard core rod are annealed together, so that the problem that the core rod is difficult to remove after cold drawing is finished is avoided, the same hard core rod can be used for multiple times, and the effect of further saving cost is achieved; in addition, the inner surface quality of the nickel-titanium alloy tube blank can be greatly ensured, so that the dimensional accuracy and the surface quality of the tube are improved.
5. According to the method, the mandrel withdrawing operation is performed after the straightening heat treatment, so that the difference of the thermal expansion coefficients of the hard mandrel and the nickel-titanium alloy material is utilized, the mandrel withdrawing treatment of the nickel-titanium alloy tube blank is facilitated, the high hardness of the hard mandrel is utilized, the high mechanical property can be maintained after long-time high temperature, the requirement of the high hardness in the cold deformation drawing process of the nickel-titanium alloy tube can be completely met, and further the processed tube is ensured to have high dimensional accuracy and surface quality.
6. The method provides a new way for preparing the medical nickel-titanium alloy tube with high precision, high surface quality and high fatigue performance, and the prepared product can be used for minimally invasive implantation of interventional heart valves, peripheral vascular stents, aortic vascular stents, left auricle occluders and the like, has good application prospect and has certain economic and social benefits.
Detailed Description
The present application is described in further detail below with reference to examples.
The application designs a processing method of a medical nickel-titanium pipe, which comprises the following steps:
s1, preparing a nickel-titanium rod blank, and then carrying out annealing treatment and surface machining treatment on the nickel-titanium rod blank;
s2, perforating and cutting the nickel-titanium rod blank prepared in the step S1 to prepare a nickel-titanium tube blank, and then cleaning and annealing the nickel-titanium tube blank;
s3, carrying out one or more cold deformation drawing treatments after penetrating the nickel-titanium tube blank prepared in the step S2 through the hard core rod;
s4, the nickel-titanium tube blank subjected to cold deformation drawing treatment in the step S3 is communicated with a hard core rod to be annealed together;
s5, circulating the step S3 and the step S4 until the nickel-titanium tube blank reaches the size of the medical nickel-titanium tube required to be prepared;
s6, straightening and heat-treating the nickel-titanium tube blank and the hard core rod obtained in the step S5, and then carrying out hard core rod removal operation to obtain a medical nickel-titanium tube semi-finished product;
s7, carrying out subsequent surface treatment on the medical nickel-titanium tube semi-finished product obtained in the step S6 to obtain a medical nickel-titanium tube finished product.
Prior to the present application, the most common form in the art for producing thin diameter thin wall nickel titanium tubing was the cold drawing process. The hard core rod drawing method is a process method which is more used. However, due to the high hardening strength and high deformation resilience of the nickel-titanium alloy, the extrusion force of the tube blank to the core rod in the drawing process is large, and a large holding force exists between the drawn tube blank and the core rod, so that the core rod is difficult to withdraw. Meanwhile, the cold drawing process is difficult to control, the small-diameter thin-wall nickel-titanium pipe prepared in China is relatively low in size precision, relatively poor in surface quality and relatively high in cost.
The applicant has studied the characteristics of nickel-titanium alloy in detail and devised the processing method of the present application after having devised the technical problems of the existing hard mandrel drawing method. Preparing a nickel-titanium rod blank by adopting a hot working process, and then perforating and wire cutting to prepare a nickel-titanium tube blank; simultaneously, the hard core rod is communicated with the nickel-titanium tube blank to be subjected to cold drawing processing, annealing, hot straightening and other treatments, and finally the core rod is removed. The whole processing method is simple and feasible, the cost is low, and the prepared nickel-titanium pipe has high dimensional accuracy, good surface quality and excellent fatigue performance, and meets the use requirement of medical implantation grade.
The following is a preparation example of the present application.
Preparation example 1
The processing method of the medical nickel-titanium pipe comprises the following steps:
s1, preparing a nickel-titanium rod blank by adopting a hot extrusion and hot rolling process, and then carrying out annealing treatment and surface machining treatment on the nickel-titanium rod blank;
s2, preparing a nickel-titanium rod blank prepared in the step S1 into a nickel-titanium tube blank by adopting an electric spark perforation and linear cutting process, and then cleaning and annealing the nickel-titanium tube blank;
s3, penetrating the nickel-titanium tube blank prepared in the step S2 through a hard core rod, and performing cold deformation drawing treatment for 1-5 times;
s4, the nickel-titanium tube blank subjected to cold deformation drawing treatment in the step S3 is communicated with a hard core rod to be annealed together;
s5, circulating the step S3 and the step S4 until the nickel-titanium tube blank reaches the size of the medical nickel-titanium tube required to be prepared;
s6, straightening and heat-treating the nickel-titanium tube blank and the hard core rod obtained in the step S5, and then carrying out hard core rod removal operation to obtain a medical nickel-titanium tube semi-finished product;
and S7, grinding and polishing the inner surface and the outer surface of the medical nickel-titanium tube semi-finished product prepared in the step S6 to prepare a medical nickel-titanium tube finished product.
In the step S1 of the preparation example, the annealing temperature is controlled to be 860-950 ℃ and the time is controlled to be 10-60 minutes;
in the step S2 of the preparation example, the annealing temperature is controlled to 760-900 ℃, atmosphere protection annealing is adopted, the time is controlled to 10-100 minutes, and the protection atmosphere adopts argon or nitrogen;
in the step S4 of the preparation example, the annealing temperature is controlled to be 610-750 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-80 minutes, and the protection atmosphere adopts argon or nitrogen;
in the step S6 of the preparation example, the heating temperature of the straightening heat treatment is controlled to be 600-700 ℃ and the time is controlled to be 1-30 min; the straightening is carried out by applying tension to the two ends of the nickel-titanium tube blank, wherein the tension is more than 100MPa.
The heating of the preparation example is carried out by adopting a heating furnace, and the heating is carried out and then is cooled by adopting an air cooling mode, and the subsequent operation is carried out.
Preparation example 2
The difference between this preparation and preparation 1 is:
in the step S1 of the preparation example, the annealing temperature is controlled to be 700-850 ℃ and the time is controlled to be 20-60 minutes.
Preparation example 3
The difference between this preparation and preparation 2 is:
in step S2 of the preparation example, the annealing temperature is controlled to be 650-750 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-60 minutes, and the protection atmosphere adopts argon or nitrogen.
Preparation example 4
The difference between this preparation and preparation 3 is:
in the step S4 of the preparation example, the annealing temperature is controlled to be 450-600 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-60 minutes, and the protection atmosphere adopts argon or nitrogen.
Preparation example 5
The difference between this preparation and preparation 4 is:
in the step S6 of the present preparation example, the straightening heat treatment is performed by placing the nickel-titanium tube blank and the hard mandrel together in a heating furnace to heat (i.e., an external heating type heating manner); or the heating (namely, an internal heating mode) of the nickel-titanium tube blank is realized by electrifying the two ends of the hard core rod and transferring heat from the hard core rod to the nickel-titanium tube blank. And then applying tension to straighten the two ends of the nickel-titanium tube blank and the hard core rod, and finally cooling the nickel-titanium tube blank and the hard core rod.
The heating temperature of the straightening heat treatment is controlled to be 400-600 ℃, the time is controlled to be 1-20 min, and the tension is controlled to be 20-100 MPa.
Preparation example 6
The difference between this preparation and preparation 5 is:
the hard core rod of this preparation example is made of high-speed steel.
Preparation example 7
The difference between this preparation and preparation 6 is:
in the step 2 of the preparation example, the wire cutting adopts medium-speed wire cutting or slow-speed wire cutting.
Preparation example 8
The difference between this preparation and preparation 7 is:
in the step S3 of this preparation example, the drawing deformation amount of the cold deformation drawing process is controlled to 8 to 25% each time.
Preparation example 9
The difference between this preparation and preparation 8 is:
in the step S3 of this preparation example, the cold-deformation drawing process uses a water-based lubricating liquid, and after the cold-deformation drawing process, the lubricating liquid and the scraps on the nickel-titanium tube blank and the hard mandrel are cleaned.
Preparation example 10
The difference between this preparation and preparation 9 is:
in the step S4 of the present preparation example, the annealing treatment is performed when the cumulative deformation amount of the cold deformation drawing treatment in the step S3 reaches 20% -45%.
PREPARATION EXAMPLE 11
The difference between this preparation and preparation 10 is:
in the step S6 of the preparation example, the core rod withdrawing operation is performed below the martensitic transformation temperature Mf of the nickel-titanium alloy, and the temperature is controlled to be between-40 ℃ and-196 ℃.
Preparation example 12
The difference between this preparation and preparation 11 is:
in the step S7 of the preparation example, the medical nickel-titanium tube semi-finished product obtained in the step S6 is subjected to inner surface pickling and outer surface centerless grinding treatment to obtain a medical nickel-titanium tube finished product.
The following are examples 1-12 of the present application.
Preparing nickel-titanium pipes by adopting preparation examples 1-12 respectively, wherein the diameter of a nickel-titanium rod blank which is initially processed in the step S1 is 35mm; the prepared target pipe has the size of 5.00mm in inner diameter and 0.15mm in wall thickness. The products prepared were the products of examples 1 to 12, respectively.
The conventional hard mandrel drawing process is adopted, a nickel-titanium tube with an inner diameter phi of 15.00mm and a wall thickness of 4.50mm is used as a tube blank, the tube blank is processed into a target tube with the inner diameter phi of 5.00mm and the wall thickness of 0.15mm, and the obtained product is used as a product of comparative example 1.
Quality tests were carried out on the products of examples 1 to 12 and comparative example 1, respectively.
The inner diameter, wall thickness, yield and recovery after deformation of 6% were measured, and the specific results are shown in Table 1.
The yield is classified into low, general, higher, high and very high grades by taking the ratio of the complete product which is used for processing 100 products and smoothly completing all the processing processes as an index. And the low, general, higher, high and very high grades correspond to a yield of 20% or less, 20-50%, 50-70%, 70-85% and 85% or more, respectively.
TABLE 1 quality test results Table
| Inner diameter (mm) | Wall thickness (mm) | Yield of finished products | Recovery after 6% deformation | |
| Example 1 | 5.05±0.07 | 0.16±0.05 | In general | 95.70% |
| Example 2 | 5.05±0.07 | 0.16±0.05 | In general | 96.10% |
| Example 3 | 5.05±0.07 | 0.16±0.05 | In general | 97.20% |
| Example 4 | 5.05±0.07 | 0.16±0.05 | In general | 98.20% |
| Example 5 | 5.05±0.07 | 0.16±0.05 | In general | 99.00% |
| Example 6 | 5.05±0.05 | 0.16±0.04 | High height | 99.00% |
| Example 7 | 5.05±0.02 | 0.16±0.02 | High height | 99.00% |
| Example 8 | 5.05±0.02 | 0.16±0.02 | High height | 99.20% |
| Example 9 | 5.05±0.01 | 0.16±0.01 | Higher height | 99.20% |
| Example 10 | 5.05±0.01 | 0.16±0.01 | Higher height | 99.6% or more |
| Example 11 | 5.05±0.01 | 0.16±0.01 | Is very high | 99.6% or more |
| Example 12 | 4.99±0.01 | 0.14±0.01 | Is very high | 99.6% or more |
| Comparative example 1 | 5.05±0.13 | 0.16±0.06 | Low and low | 96.20% |
As can be seen from the data in table 1, the recovery after deformation of 6% of the product of example 5 of the present application is significantly better than that of comparative example 1, and the products of examples 1 to 4. Can fully explain, this application adopts the annealing technology of specific processing mode and in-process, can effectively guarantee product quality, improves the anti deformability of product.
As can be seen from the data in table 1, the dimensional accuracy of the products of examples 1 to 5 of the present application is significantly better than that of comparative example 1. Can fully explain, this application adopts together carrying out cold drawing, annealing and hot straightening with stereoplasm plug and tube blank, can effectively guarantee the dimensional accuracy of product.
It can also be seen from the data in table 1 that the quality data for the products of examples 6, 7, 8 of the present application are significantly better than the products of examples 4 and 5. Therefore, after the medium-speed wire cutting or the slow-speed wire cutting process is adopted, the inner surface of the tube blank has high dimensional accuracy and good surface quality, and further the dimensional accuracy of the prepared finished tube is further improved, and the product quality is also more excellent. The high-speed steel is adopted as the material of the hard core rod, the hardness is not reduced basically below 600 ℃, so that the deformation can not occur in the annealing and the subsequent cold drawing, the dimensional accuracy of the tube blank can be ensured, and the difficulty of the core rod withdrawing operation can be greatly reduced.
It can be seen from the data in table 1 that the quality data of the products of examples 8 to 10 of the present application are further significantly improved. Therefore, after a specific cold drawing process is adopted, the dimensional accuracy of the product can be further improved, the production process is smoother, the problems of breakage, cracking, die sticking and the like are not easy to occur, the core rod is easy to withdraw, and the yield is obviously improved.
It can also be seen from the data of table 1 that the respective quality data of the products of examples 11 and 12 of the present application are most excellent. Therefore, the mandrel is removed in the low-temperature environment lower than the martensitic transformation temperature Mf of the nickel-titanium alloy, the semi-finished product tube is obtained, the characteristics of being very soft and easy to deform of the nickel-titanium alloy in the martensitic state can be effectively utilized, and the mandrel is easily removed by using the conventional mandrel removing operation; after the nickel-titanium pipe with the core rod removed is restored to room temperature, the original shape can be restored, the dimensional accuracy and the surface quality of the nickel-titanium pipe can be ensured, and the whole process hardly causes any internal stress change to the product.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (11)
1. The processing method of the medical nickel-titanium pipe is characterized by comprising the following steps of:
s1, preparing a nickel-titanium rod blank, and then carrying out annealing treatment and surface machining treatment on the nickel-titanium rod blank; the annealing temperature is controlled to be 700-850 ℃ and the time is controlled to be 20-60 minutes;
s2, perforating and cutting the nickel-titanium rod blank prepared in the step S1 to prepare a nickel-titanium tube blank, and then cleaning and annealing the nickel-titanium tube blank; the annealing temperature is controlled to be 650-750 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-60 minutes, and the protection atmosphere adopts argon or nitrogen;
s3, carrying out one or more cold deformation drawing treatments after penetrating the nickel-titanium tube blank prepared in the step S2 through the hard core rod; the hard core rod is made of high-speed steel;
s4, annealing the nickel-titanium tube blank subjected to cold deformation drawing treatment in the step S3 together with the hard core rod; the annealing temperature is controlled to be 450-600 ℃, atmosphere protection annealing is adopted, the time is controlled to be 10-60 minutes, and the protection atmosphere adopts argon or nitrogen;
s5, circulating the step S3 and the step S4 until the nickel-titanium tube blank reaches the size of the medical nickel-titanium tube required to be prepared;
s6, straightening and heat-treating the nickel-titanium tube blank and the hard core rod obtained in the step S5, and then carrying out hard core rod removal operation to obtain a medical nickel-titanium tube semi-finished product; the straightening heat treatment adopts a mode of heating the nickel-titanium tube blank and the hard core rod together in an external heating or internal heating mode, tension straightening is applied to two ends of the nickel-titanium tube blank and the hard core rod, and finally the nickel-titanium tube blank and the hard core rod are cooled, wherein the tension is controlled to be 20-100 MPa; the hard core rod removing operation is performed below the martensitic transformation temperature Mf of the nickel-titanium alloy, and the temperature is controlled to be between-40 ℃ and-196 ℃;
s7, carrying out subsequent surface treatment on the medical nickel-titanium tube semi-finished product obtained in the step S6 to obtain a medical nickel-titanium tube finished product.
2. The method for processing a medical nickel-titanium tube according to claim 1, wherein in the step S1, the size of the rod blank is 10.00-35.00 mm.
3. The method according to claim 1, wherein in the step S2, the piercing and cutting are performed by spark piercing and wire cutting.
4. The method for processing a medical nickel-titanium tube according to claim 3, wherein in the step S2, the wire cutting is performed by using a medium-speed wire cutting or a slow-speed wire cutting.
5. The method for processing a medical nickel-titanium tube according to claim 2, wherein in the step S2, the size of the prepared nickel-titanium tube blank is 5.00-15.00 mm in inner diameter and 0.20-3.00 mm in wall thickness.
6. The method for processing a medical nickel-titanium tube according to claim 1, wherein in the step S3, the drawing deformation amount of the cold deformation drawing treatment is controlled to be 8-25%.
7. The method for processing a medical nickel-titanium tube according to claim 1, wherein in the step S3, the cold-deformation drawing process uses a water-based lubricating liquid, and after the cold-deformation drawing process, the lubricating liquid and scraps on the nickel-titanium tube blank and the hard core rod are cleaned.
8. The method for processing a medical nickel-titanium tube according to claim 1, wherein in the step S4, the annealing treatment is performed when the cumulative deformation amount of the cold deformation drawing treatment in the step S3 reaches 20% -45%.
9. The method for processing a medical nickel-titanium tube according to claim 5, wherein in the step S5, the medical nickel-titanium tube to be prepared has an inner diameter phi of 2-15 mm and a wall thickness of 0.05-1.00 mm.
10. The method for processing a medical nickel-titanium tube according to claim 1, wherein in the step S6, the heating temperature of the external heating or the internal heating is controlled to be 400-600 ℃, and the time is controlled to be 1-20 min.
11. The method according to claim 1, wherein in the step S7, the subsequent surface treatment includes an inner surface pickling and an outer surface polishing treatment.
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| JPH1017963A (en) * | 1996-06-28 | 1998-01-20 | Tokin Corp | Shape memory alloy tube and its production |
| CN1295037C (en) * | 2005-05-10 | 2007-01-17 | 江苏法尔胜技术开发中心 | Sleeve pulling shaping method of nickel titanium base marmem pipe material |
| CN107838220B (en) * | 2017-09-22 | 2020-01-10 | 成都爱美科科技材料有限公司 | Preparation method of noble metal seamless pipe |
| CN109047370B (en) * | 2018-08-03 | 2021-04-13 | 陕西兴硕新材料科技有限公司 | Nickel-titanium shape memory alloy special-shaped pipe machining process |
| JP6842125B2 (en) * | 2018-08-22 | 2021-03-17 | 株式会社ジャロック | Manufacturing method of superelastic seamless tube |
| KR20210007628A (en) * | 2019-07-12 | 2021-01-20 | 주식회사 하이스틸 | Manufacturing Method for High-Manganese Cold Drawn Steel Pipes for Cryogenic Usage for the Shipbuilding and Marine Plant and the High-Manganese Cold Drawn Steel Pipes Thereof |
| CN111687237A (en) * | 2020-06-18 | 2020-09-22 | 成都先进金属材料产业技术研究院有限公司 | Cold rolling method of thick-wall capillary titanium alloy seamless pipe |
| CN112355078A (en) * | 2020-10-26 | 2021-02-12 | 有研工程技术研究院有限公司 | Aluminum oxide dispersion strengthened copper alloy pipe and preparation method and application thereof |
| CN113976659A (en) * | 2021-10-26 | 2022-01-28 | 上海工程技术大学 | Method for manufacturing metal pipe based on external field auxiliary additive |
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